EP0486544A4 - High efficiency fan. - Google Patents
High efficiency fan.Info
- Publication number
- EP0486544A4 EP0486544A4 EP19900911891 EP90911891A EP0486544A4 EP 0486544 A4 EP0486544 A4 EP 0486544A4 EP 19900911891 EP19900911891 EP 19900911891 EP 90911891 A EP90911891 A EP 90911891A EP 0486544 A4 EP0486544 A4 EP 0486544A4
- Authority
- EP
- European Patent Office
- Prior art keywords
- blades
- fan
- blade
- hub
- heat exchanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
- F04D29/386—Skewed blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
- F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/388—Blades characterised by construction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S416/00—Fluid reaction surfaces, i.e. impellers
- Y10S416/05—Variable camber or chord length
Definitions
- This invention relates to axial flow fans, for example, fans designed to move a fluid such as air through a heat exchanger such as an air conditioning condenser.
- Non-dimensional loading is the ratio of the change of pressure across the fan to the product of the density of the fluid moved by the fan and the square of the speed of the tips of the fan blades. Since non-dimensional loading is inversely proportional to the square of the tip speed, heavily loaded fans will generally have lower tip speeds, assuming the pressure drop and fluid density are relatively constant. There are several advantages to operating a fan at lower speeds (i.e., with higher non-dimensional loading) including reduced noise and vibration levels and reduced centrifugal forces acting on the fan. In addition, limits on the diameter and the capability of a particular engine or electric motor may require that the non-dimensional loading be high.
- this shroud is only slightly larger than the fan itself, but is rectangular in shape rather than circular.
- an expanding Jet of air as discussed above, will leave the fan and impinge on the sides of the shroud rather than the core. The sides of the shroud must then turn the flow, and force the air through the edges of the core.
- the invention features an axial fan which can be used to pass air through a heat exchanger without exhibiting the radial expansion seen in existing axial fans.
- The'fan comprises a hub rotatable on an axis and a plurality of blades, each of which extend radially outward from a root portion attached to the hub to a tip portion, the blades characterized by a trailing edge angle (defined as the angle between the trailing edge of the blade a____tthe plane of rotation) that varies by approximately 40° or more over the radial extent of each blade.
- the blade trailing edge angle of each of the blades is at least 60° at the root region.
- The"blades are free-tipped over a majority of their chord length, and are back skewed over at least the outer 20% of the diameter.
- the leading edge rake of the blades at the tip is at least 5% of the nominal diameteirof the blades.
- a water slinging ring is attached to radial projections on the blades.
- the hub of the fan is hollow to accommodate an electric motor or similar device.
- the fan has a solidity of at least 75% of the disk area and a blade chord near the root of each blade that is at least 80% of the blade chord near the tip of each blade.
- Fig. 1 is a cross-sectional view of a system using a fan according to the invention.
- Fig. 2 is a perspective view of the fan shown in Fig. 1.
- Fig. 3 is a plan view of the fan shown in Figs. 1-2.
- Figs. 4A-B show two cross-sections of a blade of the fan shown in Figs. 1-3. Structure and operation
- a motor 2 drives a hub 4 of a fan 6 that rotates about an axis 8.
- Fan 6 includes a plurality of blades 10 that draw air from an inlet area and force the air towards a load 12 such as the condenser of an air conditioner.
- Shroud 14 helps prevent air that has been pushed by the fan from leaking back into the inlet area.
- each blade 10 is back skewed and extends from a root portion 14 secured to hub 4 to an outer portion or tip 15.
- Each blade has a leading edge 11 and a trailing edge 13.
- Outer portion 15 of each blade is free over most of its length and is attached to a slinger ring 18 at its highest point.
- a screw 16 is used to secure fan 6 onto the shaft of motor 2.
- the trailing edge angle of each of blades 10 is defined as the angle formed between the trailing edge 13 of the blade and the plane of rotation of the blade. (E.g., the front surface 17 of hub 4 defines a plane that is parallel to the plane of rotation.)
- the trailing edge angle decreases by more than 40° over the blade length from the root 14 to outer portion 15. In the preferred 'embodiment, the trailing edge angle is greatest at the root portion 14 where it is at least 60°.
- Figs. 4A-B- show two blade cross-sections to illustrate the change in trailing edge angle. Referring to Fig. 4A, a cross-section is shown taken along line 20-20 in Fig. 3, and illustrates the trailing edge angle near root portion 14.
- FIG. 4B shows a cross-section taken along line 21-21 in Fig. 3, and illustrates the trailing edge ngle near tip portion 15. It can be clearly seen that the trailing edge angle varies by approximately 40°, and is greatest near root portion 14.
- the preferred embodiment is operated at a speed such that it is heavily loaded, and can be mounted upstream in close proximity to a heat exchanger. Due to the large change in trailing edge angle over the blade length (i.e., large blade twist), the fan generates a downstream static pressure which is lower near the hub than it is- ea ⁇ the tip of the fan. This pressure gradient will counteract radial expansion typical in heavily loaded fa-ns, so that the air does not impinge on the sides- of shroud 14. The resulting flow of air through the heat exchanger will not exhibit the extremely non-uniform distribution common in prior art fans. - -
- a further advantage is achieved by the fan's large amount of blade twist, since large blade chords can be used near the hub without overlap.
- the blade chord near the root of each blade is at least 80% of the blade chord near the tip of each blade. This reduces blade loading in that portion of the fan where blade stall is most likely to be a problem, without compromising the ability of the fan to be manufactured by plastic injection molding (i.e., no overlap).
- the large amount of blade twist also allows the axial projection of the blade tips to be minimized.
- the fan incorporates blade skew to reduce noise.
- the skew direction is opposite the blade rotation.
- This type of skew (“back skew”) requires that the pitch of the blades be higher near the root than near the tip, thereby increasing the amount of twist on the blade. This allows a further increase in the root chords, and a further decrease in the axial extent of the blade tips. Furthermore, the camber is less at the hub and greater at the tips of the blades. If the skew is in the direction of fan rotation (“forward skew”) the pitch and camber corrections are opposite those for back skew. Finally, if the skew starts in one direction and changes to the other direction, the pitch and camber corrections must vary accordingly.
- the preferred embodiment exhibits high solidity in order to minimize the possibility of blade stall. - 6 -
- the fan be moldable-by plastic injection molding (i.e., there can be no overlap)
- the axial projection of the blade at the root fit the space allocated.
- the preferred solidity of the blades and hub is at least 75% of the total disk area A, calculated according to the standard formula for area, i.e.:
- A ⁇ r 2 where r is the nominal fan radius, as defined above.
- the preferred embodiment also exhibits a large amount of leading edge rake at the tip sections, as shown in Fig. 1."
- Rake is defined as the axial position of the leading edge of the blade at a given radius relative to that at the hub radius, positive when downstream.
- the rake should be a monotonically increasing function of radius. This feature allows the fan to work well in those applications where the air is drawn from the side, since the projection of the blade outside of the shroud orifice helps the air to turn the corner.
- The-preferred amount of rake is equal to at least 5% of the nominal diameter of the blades. Since the preferred embodiment is used in an air conditioner, a condensate slinging ring is used. The slinging ring is supported by extensions to the blades near their trailing edge and serves to distribute condensate that forms on the bottom of the air conditioner. 4
- the preferred embodiment would incorporate a hub which is hollow on "the upstream side, as shown in Fig. 1, to allow ther otal axial extent of the motor and fan to be minimized.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/392,347 US4971520A (en) | 1989-08-11 | 1989-08-11 | High efficiency fan |
US392347 | 1989-08-11 | ||
PCT/US1990/004475 WO1991002164A1 (en) | 1989-08-11 | 1990-08-09 | High efficiency fan |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0486544A4 true EP0486544A4 (en) | 1992-04-02 |
EP0486544A1 EP0486544A1 (en) | 1992-05-27 |
EP0486544B1 EP0486544B1 (en) | 1995-04-05 |
Family
ID=23550227
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900911891 Expired - Lifetime EP0486544B1 (en) | 1989-08-11 | 1990-08-09 | High efficiency fan |
Country Status (5)
Country | Link |
---|---|
US (1) | US4971520A (en) |
EP (1) | EP0486544B1 (en) |
DE (1) | DE69018470T2 (en) |
ES (1) | ES2071825T3 (en) |
WO (1) | WO1991002164A1 (en) |
Families Citing this family (40)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5273400A (en) * | 1992-02-18 | 1993-12-28 | Carrier Corporation | Axial flow fan and fan orifice |
KR950007521B1 (en) * | 1992-08-14 | 1995-07-11 | 엘지전자주식회사 | Siroco fan |
US5320493A (en) * | 1992-12-16 | 1994-06-14 | Industrial Technology Research Institute | Ultra-thin low noise axial flow fan for office automation machines |
US5437541A (en) * | 1993-12-30 | 1995-08-01 | Vainrub; John | Blade for axial fan |
US5454690A (en) * | 1994-01-13 | 1995-10-03 | Shop Vac Corporation | Air flow housing |
US5478201A (en) * | 1994-06-13 | 1995-12-26 | Carrier Corporation | Centrifugal fan inlet orifice and impeller assembly |
US5730583A (en) * | 1994-09-29 | 1998-03-24 | Valeo Thermique Moteur | Axial flow fan blade structure |
US5624234A (en) * | 1994-11-18 | 1997-04-29 | Itt Automotive Electrical Systems, Inc. | Fan blade with curved planform and high-lift airfoil having bulbous leading edge |
US5588804A (en) * | 1994-11-18 | 1996-12-31 | Itt Automotive Electrical Systems, Inc. | High-lift airfoil with bulbous leading edge |
US5616004A (en) * | 1995-04-19 | 1997-04-01 | Valeo Thermique Moteur | Axial flow fan |
US5588803A (en) * | 1995-12-01 | 1996-12-31 | General Motors Corporation | Centrifugal impeller with simplified manufacture |
CN2304777Y (en) * | 1997-05-28 | 1999-01-20 | 韩玮 | Fan with wheel style paddles |
US6856941B2 (en) | 1998-07-20 | 2005-02-15 | Minebea Co., Ltd. | Impeller blade for axial flow fan having counter-rotating impellers |
US6129528A (en) | 1998-07-20 | 2000-10-10 | Nmb Usa Inc. | Axial flow fan having a compact circuit board and impeller blade arrangement |
US6565334B1 (en) | 1998-07-20 | 2003-05-20 | Phillip James Bradbury | Axial flow fan having counter-rotating dual impeller blade arrangement |
KR100648089B1 (en) * | 1999-12-30 | 2006-11-23 | 한라공조주식회사 | Axial fow fan assembly |
US6712584B2 (en) * | 2000-04-21 | 2004-03-30 | Revcor, Inc. | Fan blade |
US6814545B2 (en) * | 2000-04-21 | 2004-11-09 | Revcor, Inc. | Fan blade |
US6447251B1 (en) | 2000-04-21 | 2002-09-10 | Revcor, Inc. | Fan blade |
US20030124001A1 (en) * | 2002-01-02 | 2003-07-03 | Chien-Jung Chen | Heatsink fan structure |
US6914779B2 (en) * | 2002-02-15 | 2005-07-05 | Microsoft Corporation | Controlling thermal, acoustic, and/or electromagnetic properties of a computing device |
AU2003233439A1 (en) * | 2002-03-30 | 2003-10-20 | University Of Central Florida | High efficiency air conditioner condenser fan |
US7249931B2 (en) * | 2002-03-30 | 2007-07-31 | University Of Central Florida Research Foundation, Inc. | High efficiency air conditioner condenser fan with performance enhancements |
US6942457B2 (en) * | 2002-11-27 | 2005-09-13 | Revcor, Inc. | Fan assembly and method |
TWI236520B (en) * | 2004-02-18 | 2005-07-21 | Delta Electronics Inc | Axial flow fan |
DE102005005977A1 (en) * | 2005-02-09 | 2006-08-10 | Behr Gmbh & Co. Kg | Axial |
US7374403B2 (en) * | 2005-04-07 | 2008-05-20 | General Electric Company | Low solidity turbofan |
US7476086B2 (en) * | 2005-04-07 | 2009-01-13 | General Electric Company | Tip cambered swept blade |
JP4844190B2 (en) * | 2006-03-27 | 2011-12-28 | パナソニック株式会社 | Propeller fan and pipe exhaust fan |
KR20080062891A (en) * | 2006-12-29 | 2008-07-03 | 엘지전자 주식회사 | Fan in the air conditioner |
KR101546905B1 (en) * | 2008-01-30 | 2015-08-24 | 엘지전자 주식회사 | Outdoor unit of air-conditioner |
JP2013209956A (en) * | 2012-03-30 | 2013-10-10 | Sanyo Denki Co Ltd | Axial flow fan |
EP2971521B1 (en) | 2013-03-11 | 2022-06-22 | Rolls-Royce Corporation | Gas turbine engine flow path geometry |
JP1555680S (en) * | 2016-03-01 | 2016-08-08 | ||
US10458426B2 (en) | 2016-09-15 | 2019-10-29 | General Electric Company | Aircraft fan with low part-span solidity |
USD930722S1 (en) | 2020-11-23 | 2021-09-14 | Elliot Kremerman | Spinner with magnets |
USD935497S1 (en) | 2021-08-02 | 2021-11-09 | Elliot Kremerman | Spinner |
USD934316S1 (en) | 2021-08-02 | 2021-10-26 | Elliot Kremerman | Spinner |
USD935496S1 (en) | 2021-08-02 | 2021-11-09 | Elliot Kremerman | Spinner |
USD934930S1 (en) | 2021-08-02 | 2021-11-02 | Elliot Kremerman | Spinner |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB376647A (en) * | 1932-01-01 | 1932-07-14 | William Alexander | Improvements in the blades of screw rotors for operating with any fluid |
DE1111334B (en) * | 1959-09-04 | 1961-07-20 | Paul Pollrich & Comp | Fan or centrifugal pump with housing |
FR1326701A (en) * | 1962-05-09 | 1963-05-10 | Plannair Ltd | Improvements to blowers and rotary compressors |
DE1428273A1 (en) * | 1964-09-29 | 1969-01-02 | Siemens Ag | Axial fan |
US4411598A (en) * | 1979-12-12 | 1983-10-25 | Nissan Motor Company, Limited | Fluid propeller fan |
US4685513A (en) * | 1981-11-24 | 1987-08-11 | General Motors Corporation | Engine cooling fan and fan shrouding arrangement |
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US652123A (en) * | 1899-09-14 | 1900-06-19 | Peter Godfroy Lavigne | Screw-propeller. |
US1620875A (en) * | 1921-03-07 | 1927-03-15 | Gail G Currie | Fan wheel |
US1706608A (en) * | 1927-08-05 | 1929-03-26 | Frank W Holmes | Fan |
GB356691A (en) * | 1930-03-08 | 1931-09-08 | Mykas Adamcikas | Improvements in and relating to the blades of fans or ventilators |
US2569632A (en) * | 1949-09-12 | 1951-10-02 | Safway Steel Products Inc | Joint |
US2915238A (en) * | 1953-10-23 | 1959-12-01 | Szydlowski Joseph | Axial flow compressors |
US2936948A (en) * | 1954-10-15 | 1960-05-17 | Eck Bruno Christian | Axial blower with cone-shaped hub |
US3014534A (en) * | 1957-04-16 | 1961-12-26 | Enso Gutzeit Oy | Impeller, propeller and the like for producing axial effect, particularly axial air flow |
FR1183713A (en) * | 1957-07-12 | 1959-07-13 | Calor Sa | Molded material propeller |
US2976352A (en) * | 1957-11-14 | 1961-03-21 | Torrington Mfg Co | Blower unit |
FR1218500A (en) * | 1958-12-12 | 1960-05-11 | Lyonnaise Ventilation | Improvements to meridian-accelerated axial fans |
FR1256045A (en) * | 1960-02-03 | 1961-03-17 | Improvements to axial compressor wheels working at transonic and supersonic speeds | |
FR77081E (en) * | 1960-02-03 | 1962-01-12 | Improvements made to axial compressor wheels | |
US3111173A (en) * | 1960-06-30 | 1963-11-19 | Torrington Mfg Co | Fan with slinger ring |
US3169694A (en) * | 1963-04-08 | 1965-02-16 | Borchers Ariel George | Propeller fans and the like |
US3444817A (en) * | 1967-08-23 | 1969-05-20 | William J Caldwell | Fluid pump |
DE2327125C3 (en) * | 1973-05-28 | 1979-11-15 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Axial fan with housing |
US3995603A (en) * | 1974-04-08 | 1976-12-07 | Hans List | Cooler-cum-blower assembly for internal combustion engines |
US4358245A (en) * | 1980-09-18 | 1982-11-09 | Bolt Beranek And Newman Inc. | Low noise fan |
US4569632A (en) * | 1983-11-08 | 1986-02-11 | Airflow Research And Manufacturing Corp. | Back-skewed fan |
FR2617904B1 (en) * | 1987-07-09 | 1992-05-22 | Peugeot Aciers Et Outillage | FALCIFORM BLADE FOR PROPELLER AND ITS APPLICATION IN PARTICULAR TO MOTOR FANS FOR AUTOMOBILES |
US4900229A (en) * | 1989-05-30 | 1990-02-13 | Siemens-Bendix Automotive Electronic Limited | Axial flow ring fan |
US4915588A (en) * | 1989-06-08 | 1990-04-10 | Siemens-Bendix Automotive Electronics Limited | Axial flow ring fan with fall off |
-
1989
- 1989-08-11 US US07/392,347 patent/US4971520A/en not_active Expired - Lifetime
-
1990
- 1990-08-09 ES ES90911891T patent/ES2071825T3/en not_active Expired - Lifetime
- 1990-08-09 EP EP19900911891 patent/EP0486544B1/en not_active Expired - Lifetime
- 1990-08-09 DE DE69018470T patent/DE69018470T2/en not_active Expired - Fee Related
- 1990-08-09 WO PCT/US1990/004475 patent/WO1991002164A1/en active IP Right Grant
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB376647A (en) * | 1932-01-01 | 1932-07-14 | William Alexander | Improvements in the blades of screw rotors for operating with any fluid |
DE1111334B (en) * | 1959-09-04 | 1961-07-20 | Paul Pollrich & Comp | Fan or centrifugal pump with housing |
FR1326701A (en) * | 1962-05-09 | 1963-05-10 | Plannair Ltd | Improvements to blowers and rotary compressors |
DE1428273A1 (en) * | 1964-09-29 | 1969-01-02 | Siemens Ag | Axial fan |
US4411598A (en) * | 1979-12-12 | 1983-10-25 | Nissan Motor Company, Limited | Fluid propeller fan |
US4685513A (en) * | 1981-11-24 | 1987-08-11 | General Motors Corporation | Engine cooling fan and fan shrouding arrangement |
Non-Patent Citations (1)
Title |
---|
See also references of WO9102164A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2071825T3 (en) | 1995-07-01 |
EP0486544A1 (en) | 1992-05-27 |
EP0486544B1 (en) | 1995-04-05 |
WO1991002164A1 (en) | 1991-02-21 |
DE69018470D1 (en) | 1995-05-11 |
US4971520A (en) | 1990-11-20 |
DE69018470T2 (en) | 1995-07-27 |
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